Global Patent Index - EP 2993244 A1

EP 2993244 A1 20160309 - Method to produce high strength products extruded from 6xxx aluminium alloys having excellent crash performance

Title (en)

Method to produce high strength products extruded from 6xxx aluminium alloys having excellent crash performance

Title (de)

Herstellungsverfahren eines Strangpressprofils aus 6xxx Aluminiumlegierung mit ausgezeichneter Crashverhalten

Title (fr)

Procédé de fabrication d'un produit extrudé en aluminium alliage 6xxx avec d'excellentes performances de l'accident

Publication

EP 2993244 A1 20160309 (EN)

Application

EP 14003062 A 20140905

Priority

EP 14003062 A 20140905

Abstract (en)

An aluminium alloy extruded product obtained by following steps: a) casting a billet from a 6xxx aluminium alloy comprising: Si: 0.3-1.5 wt. %; Fe: 0.1-0.3 wt. %; Mg: 0.3-1.5 wt. %; Cu< 1.5 wt.%; Mn<1.0 %; Zr< 0.2 wt.%; Cr< 0.4 wt.%; Zn< 0.1wt.%; Ti< 0.2 wt.%, V< 0.2 wt.%, the rest being aluminium and inevitable impurities; wherein the content of eutectic forming elements (Mg, Si and Cu) is selected so as to present in equilibrium conditions a solidus to solvus difference higher than 5°C, preferably 20°C ; b) homogenizing the cast billet at a temperature 30°C to 100°C lower than solidus temperature; c) heating the homogenized billet at a temperature lower than solidus Ts, between Ts and (Ts - 45 °C) and superior to solvus temperature; d) cooling until billet temperature reaches a temperature between 400°C and 480 °C while ensuring billet surface never goes below a temperature substantially close to 350 °C; e) extruding at most a few tens of seconds after the cooling operation the said billet through a die to form at least an extruded product; f) quenching the extruded product down to room temperature; g) optionally stretching the extruded product; h) ageing the extruded product, without beforehand applying on the extruded product any separate post-extrusion solution heat treatment, the ageing treatment being applied such that: €¢ Crash test samples cut from the said profile provided with a regularly folded surface having cracks with a maximal length of 5 mm, when axially compressed such that the crush distance is higher than half their length. €¢ Tensile test samples having Rp0.2 > 240 MPa, preferably higher than 280 MPa.

IPC 8 full level

C22C 21/02 (2006.01); C22C 21/08 (2006.01); C22F 1/05 (2006.01)

CPC (source: CN EP US)

B21C 23/04 (2013.01 - US); C22C 21/02 (2013.01 - CN EP US); C22C 21/08 (2013.01 - CN EP US); C22F 1/002 (2013.01 - EP US); C22F 1/05 (2013.01 - CN EP US)

Citation (search report)

Citation (third parties)

Third party : Anonymous

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  • EP 3189171 A1 20170712 - CONSTELLIUM VALAIS SA (LTD) [CH], et al
  • ODDVIN REISO: "The effect of Billet Preheating Practice on extrudability of AI-Mg-Si alloys", PROCESSINGS OF THE 4TH INTERNATIONAL ALUMINIUM EXTRUSION TECHNOLOGY SEMINAR, vol. II, 1988, pages 287 - 295, XP055639629
  • BIN-LUNG OUCHIN-HUI SHEN: "Impact of pre-aging on the tensile and bending properties of AA 6061", SCANDINAVIAN JOURNAL OF METALLURGY, vol. 34, 2005, pages 318 - 325, XP055639598, DOI: 10.1111/j.1600-0692.2005.00723.x
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  • H. BICHSEL, A. RIED: "Zusammenhang zwischen Abschreckempfindlichkeit und Zwiscchenlagereffekt bei AlMgSi-Legierunp", SYPOSIUM DER DEAUTCHEN GESELLSHAFT FÜR METALLKUNDE,, 1973, pages 173 - 192, XP055639609
  • ODDVIN, REISOJOHN ERIK HAFSASODGEIR SJOTHUNULF TUNDAL: "The Effect of Cooling Rate After Homogenization and Billet Preheating Practice on Extrudability and Section Properties - Part 1: Extrudability and Mechanical Properties", PROCEEDINGS OF THE 6TH ALUMINIUM EXTRUSION TECHNOLOGY SEMINAR, vol. I, 14 May 1996 (1996-05-14), pages 1 - 10, XP055639643
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  • JOSTEIN ROYSETULF TUNDALODDVIN REISOTROND FURU: "Al-Mg-Si Alloys Improved Crush Properties", THE NINTH INTERNATIONAL ALUMINIUM EXTRUSION TECHNOLOGY SEMINAR - ET'08, 13 May 2008 (2008-05-13), XP055639635

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 2993244 A1 20160309; EP 2993244 B1 20200527; CA 2959216 A1 20160310; CA 2959216 C 20220816; CN 106605004 A 20170426; CN 106605004 B 20191224; EP 3189171 A1 20170712; EP 3189171 B1 20181205; MX 2017002586 A 20170816; US 11186903 B2 20211130; US 2017306465 A1 20171026; WO 2016034607 A1 20160310

DOCDB simple family (application)

EP 14003062 A 20140905; CA 2959216 A 20150902; CN 201580047705 A 20150902; EP 15760431 A 20150902; EP 2015070000 W 20150902; MX 2017002586 A 20150902; US 201515508243 A 20150902